Getting a List of Stylesheets for a Book Done in InDy CC2018

An online search gave me a few hits, all of which seemed to lead to the same line. And that link led to a page in what I presume is Chinese; and I have no idea whether the page was hijacked, or what. So does anyone know of a script that's up-to-date. It'd be ideal if it somehow worked form the .indb panel, collecting for the whole book at once (and obviously eliminating duplicates). Thank you.